https://www.opendns.com/about/innovations/dnscrypt/
http://superuser.com/questions/424934/what-are-the-pros-and-cons-of-using-an-alternative-dns-instead-of-the-isp-dns-se
http://www.groovypost.com/howto/fix-dns-leaks-last-mile-dnscrypt-opendns/
https://www.dnsleaktest.com/results.html
https://www.doileak.com/blog-DNS%20Server%20for%20privacy.html
